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Concatenated error correction code
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<p> In <a href="/facts/Coding_theory/SBqStoGL">coding theory</a>, concatenated codes form a class of <a href="/facts/Error-correcting_code/cLUTUJrA">error-correcting codes</a> that are derived by combining an inner code and an outer code. They were conceived in 1966 by <a href="/facts/Dave_Forney/dKvnKPT2">Dave Forney</a> as a solution to the problem of finding a code that has both exponentially decreasing error probability with increasing block length and <a href="/facts/Polynomial-time/77T62gmf">polynomial-time</a> decoding <a href="/facts/Computational_complexity_theory/etHuVF3U">complexity</a>. Concatenated codes became widely used in space communications in the 1970s. </p>